What if you want to touch base with a group of friends or family right now, or maybe later today — except they’re spread out all over the globe? Leave the details to Pixcall, a new iOS app. Created as an alternative to one-on-one FaceTime chats or group Google Hangouts, Pixcall is based on still photos shot simultaneously by selected participants — a kind of hybrid photo messaging. At times when calling everyone or initiating a group chat takes too much time, or you...